Substituted 1-(loweralkyl-sulfinylbenzylidene)-3-indenyloxyacetic acid and esters thereof

ABSTRACT

NEW SUBSTITUTED INDENE ACIDS AND NON-TOXIC PHARMACEUTICALLY ACCEPTABLE AMIDES, ESTERS AND SALTS DERIVED THEREFROM. THE SUBSTITUTED INDENE ACIDS DISCLOSED HEREIN HAVE ANTI-INFLAMMATORY, ANTI-PYRETIC AND ANALGESIC ACTIVITY. ALSO INCLUDED HEREIN ARE METHODS OF PREPARING SAID INDENE ACID COMPOUNDS, PHARMACEUTICAL COMPOSITIONS HAVING SAID INDENE ACID COMPOUNDS AS AN ACTIVE INGREDIENT AND METHODS OF TREATING INFLAMMATION BY ADMINISTERING THESE PARTICULAR COMPOSITIONS TO PATIENTS.

United States Patent SUBSTITUTED I-(LOViERiALKYL-SULFINYLBENZ- YLIDENE)-3-INDENYLOXYACETIC ACID AND ESTERS THEREOF 'Tsung-Ying Shen, Westfield, Howard Jones, Holmdel, and

Michael W. Fordice, Cranford, NJ., assignors to Merck & Co., Inc., Rahway, NJ. N0 Drawing. Filed Jan. 21, 1971, Ser. No. 108,631 Int. Cl. C07c 147/14 US. Cl. 260520 7 Claims ABSTRACT OF THE DISCLOSURE This invention relates to new substituted indenyl acid compounds and processes for producing the same. More specifically, this invention relates to compounds having the following general formula:

is aryl or heteroaryl;

R is alkylsulfinyl or alkylsulfonyl;

R is hydrogen, halogen, hydroxy, alkoxy or haloalkyl;

and

M is hydrQ Y, loweralkoxy, substituted loweralkoxy, amino,.alkylamino, dialkylamino, N-morpholino, hydroxyalkylamino, polyhydroxyalkylamino, dialkylaminoalkylamino, aminoalkylamino or OMe in which Me is a cation.

The indene nucleus may be substituted in the l-position by an aryl ring system such as benzene, naphthalene or biphenyl or a heteroaryl ring system such as a pyrrole, furan, thiophene, pyridine, imidazole, pyrazine, thiazole, etc. which contains an alkylsulfinyl or alkylsulfonyl sub- (chloro, fluoro or bromo), hydroxy, alkoxy (methoxy, ethoxy, propoxy, etc.) or haloalkyl (fluoromethyl, chloroethyl, trifluoromethyl, etc.) group. p

Representative compounds of this invention are as follows:

'stituent' and may be further substituted with a halogen Patented June 5, 1973 ice 5, 6-di-fluoro-2-methyll- (4'-methylsulfinylbenzylidene S-indenyloxyacetic acid S-fluoro-Z-methyl-1-(4'-methylsulfinylbenzylidene)- S-indenyloxyacetic acid 5-chloro-2-methyl-1- (4'-methylsulfinylbenzylidene)- 3-indenyloxyacetic acid 5,6-di-fluoro-2-methyl-1-(4'-methylsulfinylbenzylidene)- 3-indenylthioacetic acid 5-fluoro-2-methyl- 1- (4'-methylsulfinylb enzylidene) 3-idenylthioacetic acid 5-allyloxy-2-methyl-1-(4'-methylsulfinylbenzylidene)- 3-indenylthioacetic acid S-dimethylamino-Z-methyl- 1- 4'-methylsu1flnylbenzylidene)-3-indenylthioacetic acid N- [5 ,6 -difluoro-2-methyl- 1- (4'-methylsulfinylb enzylidene)-3-indenyl]-N-methylglycine N- [5-fluoro-2-methyl- 1- 4-methylsulfinylbenzylidene) 3-idenyl1-N-methylglycine N- [5, 6-difluoro-2-methyl- 1- (4'-methylsulfinylbenzylidene)-3-indenyl]-glycine and the corresponding amides, esters and pharmaceutically acceptable salts thereof.

It should be noted that the compounds of this invention may be isomen'zed into their cis and trans isomers by procedures well known in the art. It should be further noted that the cis isomer of the compounds of this invention is substantially more active than the trans isomer. Accordingly, it is to be understood that reference throughout the specification and appended claims to the compounds of this invention is intended to encompass not merely the compounds per se but includes their geometric isomers (cis, trans).

-It should be further noted by one skilled in the art that the alkylsulfinyl derivatives of this invention are racemic mixtures of optically active enantiomorphs which may be resolved into their and forms by techniques well known in the art.

One skilled in the art should further note that some of the compounds of this invention are polymorphic and have different crystalline structures, melting points and solubility characteristics.

This invention also relates to a method of treating pain, fever or inflammation in patients using a compound of Formula I, particularly an especially preferred compound as the active constituent.

The compounds of the instant invention can be used to treat inflammation by reducing inflammation and relieving pain in such diseases as rheumatoid arthritis, osteoarthritis, gout, infectious arthritis and rheumatic fever.

The compounds of Formula I also have anti-pyretic and analgesic activity and would be administered and used in the same manner and in the same dosage ranges as if they were being used to treat inflammation as discussed further on.

The treatment of inflammation in accordance with the method of the present invention is accomplished by topically, orally, rectally or parenterally administering to patients a composition of a compound of Formula I, particularly the especially preferred compounds in a non-toxic pharmaceutically acceptable carrier.

The non-toxic pharmaceutical carrier may be, for example, either a solid or a liquid. Exemplary of solid car riers are lactose, corn starch, gelatin, talc, sterotix, stearic acid, magnesium stearate, terra alba, sucrose, agar, pectin, Cab-O-Sil, and acacia. Exemplary of liquid carriers are peanut oil, olive oil, sesame oil and water. Similarly, the carrier or diluent may include a time delay material such as glyceryl monostearate or glyceryl distearate alone or with a wax.

Several pharmaceutical forms of the therapeutically useful compositions can be used. For example, if a solid carrier is used, the compositions may take the form of tablets, capsules, powders, troc'hes or lozenges, prepared room temperature, butliquid at the rectal temperature.

Such materials are cocoa butter and polyethylene glycol.

Gels and lotions for topical application may be prepared in conventional manners. g

The active compounds of Formula I and of the compositions of this invention are administered in an amount suflicient to treat inflammation, that is to reduce inflammation. Advantageously, the compositions will contain the active ingredient, namely, the compounds of Formula I in an amount of from about 0.1 mg. to 50 mg. per kg.

body weight per day (5 mg. to 3.5 g. per patient per day),

preferably from about 1 mg. to 15 rug/kg. body weight per day (50 mg. to 1 g. per patient per day).

The method of treatment of this invention comprises administering to a patient (animal or human) a compound of Formula I, particularly an especially preferred,

compound admixed with a non-toxic pharmaceuticalcarrier such as exemplified above. The compounds of Formula I and particularly the especially preferred compounds will be administered in an amount of from 0.1

mg. to 50 mg./kg. body weight per day, preferablyfrom" about 1 mg. to about 15 mg. per kilogram body Weight per day. The most rapid and effective anti-inflammatory effect is obtained from oral administration of a daily dosage of from about 1 to 15 mg./kg. per day. It should be understood, however, that although preferred dosage "I ranges are given the dose level for any particular patient depends upon the activity of the specific compound employed. Also many other factors that modify theactions I of drugs will be taken into account by those skilled in the art in the therapeutic use of medicinal agents, particularly those of Formula I, for example, age, body weight, sex, diet, time of administration, route of administration, rate of excretion, drug combination, reaction sensitivities an severity of the particular disease. I

In thepreparation of the indenyloxy acid compounds 3 of this invention, the starting material is an indane-1,3- dione which is prepared by the reaction of a dimethyl phthalate with an alkyl propionate. The indane-1,3-dione is reacted with ethylene glycol and a benzyl-magnesium halide to produce the corresponding 3-benzylidene-1-indanone which is converted to the corresponding indenyloxyacetate .(or other ester) in dimethoxyethane; This indenyloxyacetate is then converted to the free acid I The indenylthio acid compounds of this invention-are prepared by the reaction of a 3-benzylideue-Lindanone with thionyl chloride followed by reactionwith-a thioglycolate while the glycine derivatives are prepared by the reaction of a 3-benzylidenewl-indanonederivative with thionyl chloride, followed by reaction with a glycine.

, Although the syntheses described produce esters of the acids of this invention, some desired esters are more easily obtained by forming a simple ester of the final acid, ,hydrolyzingwto thefree acid and re-esterifying. The simple'loweralkyl or benzyl esters are usually. the ones used in the synthesis of the compounds. Other esters are-more desirable from the standpoint of therapeutic utility of the compounds, such as the methoxymethyl, .diethylaminoethyl, dimethylaminoethyl, dimethylaminopropyl, diethylaminopropyl, N pyrollidinylethyl, N piperidinylethyl, N-morpholinylethyl, N-ethy1-2-piperidinylethyl,' N-pyrol- :lidinylmethyl, N-methyl-2-pyrollidinylmethyl, 4-methyl1- I piperazinylethyl, methoxyethyl, ethoxyethyl; and" the like.

These are mostly prepared from the corresponding alcohol and the indenyl acid. i

n The amides, both the simple amide and the substituted 7 v I v o amides, are similarly prepared from the indenyl acids and 75 end 'Of the addition period the tilixture is wiim d to trate the invention:

7 Starting material is P a mole) nether (l'liter) .byfthe 'recyclingpr'o'cednire ofRoWlan s etf al., [Grignard Reactionsof N omneta llic the corresponding amines. Especially useful therapeutical- ""ly are "the merpholide, the bisthydroxyerhylfimide and metal or alkaline earth saltsand the amine and quaternary ammonium salts,..which are water soluble, but the heavy metal salts uch as-iron,. aluminumpetc. are also'use'ful for some purposes. v V

The following example s 'are presented to further illus- EXAMPLE 1 1.

( A) 5,6-difluoro-2 methylindane 1,3-dione To dimethyl-4,5-difluorophthalate' 230.17 1.0 mole) and ethyl propionatef( 15312'g1, 1.55 moles) is added sodium (27.6 g., 1.2 moles)'i"-l:he mixture is slowly heated to boiling and refluxed for 4 hours.' The mixture is cooled to room temperature and. slur' ried with sodium hydroxide (l N, 1 liter), filtered, and washed with waterfThe residue is taken up in e ther-2 N sulfuric' acid, the ether layer washed with water, saturated salt solution, dried (MgSO concentrated and distilled to yield 5,6-difluoro- 2-methylindane-'1,3-dione.' (B) 5,6-difluoro-3,'3-ethylenedioxy-Z-methyl-1- The indanedi'one f.(137;3fg .,;0.7. mole) from Example 1'-A, ethylene glycol (43.3 g., 0.7 mole), benzene (500 ml.) and p-toluenesulfonic acid (200 g.) are refluxed until the theoretical volume of water is removed by means of a Dean-Stark separatorpThemixture is cooled to 0, ice (50 g.) added and neutralized with 5% sodium bicarbonate solution. The layers are separated, the water layer washed with benzene, the/benzene extract dried (MgSO and concentrated. The concentrate is distilled in vacuo to yield 5,6-difluoro-3,3-ethylenedioxy-2-methyll-indanone.

Using the reaction conditions and techniques of Example 1, Parts A and Bythe following phthalates are converted to indanones. The phthalates form unsym- ,metrical diones, each of which forms. two ethylenedioxy Product A Product B Dimethyl-Qfiuoro- 5-fluoro-2-methyl- 5-fiuoro and 6- fluorophthalate. indane-1,3-dione. 3,3-ethylenedioxy- 'Z-methyl-l-indanone. Dim'ethyli t-fluoro- 5-mothoxy-6-fiuoro- 5 'methoxy-6-fluorosnethoxyphthalate. 2 methylindaneand 5-fiuoro-6;

- 1,3-dio'ne. meth0xy 3,3-ethylenedioxy-Z-methylp l-indanone. Dimcthyl-4-cyan0- 5-cyano-2-methylfi-cyanoand ti-cyanophthalate. indane-lj3-dione. 3,3-ethylenedioxy- 1 2-1nethy1-1-indanone. Dimethyl-4-allyloxy- 5-ally1oxy-2-methyl- 5-a11yl0xy and 6-- I phthalate. indane-lfi dione. allyloxy 3',3-ethylenej dioxy-2-methyl-1- s indanone; DlmBthyl-l-ChlOIO- 5-chloro-2-methyl- 5-ehloro and fi-chloro- 3,3-ethylenedi'oxy-2- phthalate. indans-1,3-dione.

methyl-l-indanone.

'methyl-l-(4'-methylthiobeniylidene):indene .A, solutionof v4+methylthiobenzylmagnesinm bromide anon 4-rnethylthiobenzylbromide. (108.6. g-.,

Substanc s, Kharaschand OJReinmuth, Prentice ""i-B in ether"(2 liters) at 01,at s cha ratjelthatthe LGilman test for free (irignardl Reagent is neve]; positives At the 2025 and maintained for 2 hours. The mixture is cooled to 5-10, quenched with 700 ml. of saturated ammonium chloride, filtered, the ethereal solution washed with Water, saturated sodium chloride solution and dried (MgSO The ethereal mixture is concentrated to 1500 ml.,-pyridine (150 ml.) is added, the mixture cooled to l, and thionyl chloride (71.4 g., 0.6- mole) is added dropwise with stirring. After the addition is completed the mixture is allowed to warm spontaneously to'ro'om temperature and poured into water and ice (2 kg.). After thorough mixing the'layers are separated, the ether layer is washed with water, dried (MgSO and concentrated in atmospheric pressure, then in vacuo. The residue is chromatographed on silica gel and eluted with methanolic chloroform to obtain cisand trans-5,6-difluoro-3,3-ethyl- 'enedioxy 2 methyl-1-(4'-methylthioben'zylidene')-indane and these individually recrystallized from ethyl acetate-n-hexane.

(D) Cis-S,6-difluoro-2-rnethyl-3- (4-methylthiobenzylidene)-l-indanone The cisketal (108.7 g., 0.3 mole) of Example 1-C in 75% acetic acid (2 liters) is heated for 20 minutes on the steam bath. The mixture is concentrated in vacuo to ca. one-fourth of the original volume and the concentrate diluted with an equal volume of water and extracted with ethyl acetate (3x 750 ml.). The ethyl acetate extract is extracted with water, 5% sodium carbonate solution, water and saturated salt solution. The ethyl acetate extract is dried v(MgSO and concentrated to dryness in vacuo. The residue is crystallized from acetone-n-hexane to yield 'cis-5,6-difluoro-2-methyl-3-(4'-methylthiobenzylidene)-1-indanone.

(iE) Ethyl-cis-5,6-difluoro-2-methyl-1-(4'-rnethylthiobenzylidene -3-indenyloxyacetate To a mixture of indanone (73.3 g., 0.2 mole) from Example 1-D in dimethoxyethane (733 ml.) is added gradually withstirring at -15 an oil-free suspension of sodium hydride. (4.8 g., 0.2 mole). When hydrogen evolution is complete, ethyl bromoacetate (33.4 g., 0.2 mole) is added dropwise with. stirring at 20. The mixture is slowly warmed to 60 with stirring and maintained thus for 2:hours. The mixture is cooled to cautiously diluted with water (750 ml.) and extracted with benzene (3 X ,1 liter). The benzene extract is washed with water, saturated saltsolution, dried (MgSO and concentrated to dryness in vacuo. The residue is crystallized and recrystallized from ethyl acetate-n-hexane to yield --e'thyl-cis-5,6difluoro 2 methyl-1-(4'-methylthio benzyliden'e)-3 indenyloxyacetate.

(F) Cis-5,6-difluoro-2methyl-l-(4'-rriethylthiobenzylidene)-3-indenyloxyacetic acid with water and dried in air at The residue is recrystallized from acetone-n-hexane to yield cis-5,6 -difluoro-2- methy1-1-(4' methylthiobenzylidene)-3-indenyloxyacetic acid. f 1' '(G) Cis-5,6-difluoro-2-methyl-1-(4-methylsulfinyl benzylidene) -3-indenyloxyacetic acid 7 Sodium metaperiodate trihydrate (11.3 g., 0.0422 mole) in water (85 ml.) is added to cis-5,,6-difluoro-2-methyl-1- (4-methylthiobenzylidene)-3-indenyloxyacetic acid (3.74

6. filteredThe precipitate is washed well with water, dried in air, thenin vacuo at and recrystallized from ethyl acetate-n-hexane to yield cis-5,6-difluoro-2-methyl-1-(4'- rnethylsulfinylbenzylidene)-3-indenyloxyacetic acid.

Using the reaction conditions and techniques of Example l, Parts C through G, the following indenyloxy acetic acids are prepared:

Starting material" Product 5-cyano and ficyano-3,3-ethylenedioxy-2-methyl-l-indanone.

5-a1lyloxy and 6-allyloxy-33-cthy1- enedioxy-Z-methyl-l-indanone.

benizylidene)-3-indenyloxyacetic aci Cis-S-chloro and 6-chloro-2-methyl 1-(4'-methylsulfinylbenzylidene)-3-indenyloxyacetic acid.

Schloro and 6-chloro-3.3-ethylenedioxy-2-methyl-l-indanone.

EXAMPLE 2 EXAMPLE 3 s A) -Cis-3-chloro-5,6-difluoro-2-methyl-1- (4-methylthiobenzylidene) -indene To cis 5,6-difluoro 2 methyl-3-(4-methylthiobenzylidene)- 1-indanone (73.3 g., 0.2 mole) in benzene (250 ml.) is 'aded'thionyl chloride (29.7 g., 0.25 mole) in benz'ene (100 'ml.).The mixture is slowly warmed to reflux with stirring and refluxed for 2 hours. The mixture is cooled to 20 and poured into ice and water (1 kg.). The

layers are separated, the benzene layer washed with water g., 0.01 mole) in methanol (240 ml.) and acetone (10 ml.) at room temperature. The mixtureis stirred overnight after which only a trace of starting material remains and only a trace of sulfone has formed. The mixture is concentrated to small volume, diluted with water and and satu'rat'edsalt solution, dried (MgSO and concentrated to dryness in vacuo. The residue is crystallized from ethyl acetate-n-hexane to yield cis-3-chloro-5,6-difluoro- Z-methyl- 1- 4"-m ethylthiobenzylidene -indene.

(B) Cis-3-chloro-5,6difluoro-2-methyl-1- (4'-methylsulfinylbenzylidene)-indene The product (3.35 g., 0.01'mole) of Example 3-A by the method of Example l-G is converted to cis-3-chlorof. 5,6-difluoro-2-rnethyl 1-(4f methylsulfinylbenzylidene)- indene.

(C) Cis-5,6-difluoro-2-methyl-1-(4-methylsulfinylbenzylidene)-3-indenylthioacetic acid Tornethyl thioglycolate (0.212 g., 0.002 mole) in absolute methanol (20 ml.) is added sodium rnethoxide (0.108 g.,, 0.002 mole) and the mixture is concentrated to dryness'irr vacuo.'Theresidue is slurried with'dimethoxyethane (20ml.) .and to this cis-3-chloro-5,6-difluoro-2- methyl 1-(4'-methylsulfinylbenzylidene) indene (0.701 g.,

0.002 mole) is added. With stirring the mixture is warmed to reflux over30 minutes. and maintained at reflux for 4 hours. The mixture is taken to dryness in vacuo, diluted with sodium hydroxide (0.1 N, 30 ml.) and again heated at-reflux for 1 hour. The mixture is cooled to 20, acidified with concentrated hydrochloric acid and filtered. The residue is dried in air and crystallized from acetone-nhe'xane to yield cis-5,6-difluoro-2-methyl-l-(4'-methylsul finylbenzylidene)-3-indenylthioacetic acid.

Using the reaction conditions and techniques of Examples 3-A, 3-B and 3C, the following indenylthioacetic acids are obtained: I

Starting material Product (Dis-5 or 6-fiuoro-2-methyl-1-(4'- methylthiobenzylidene)-1- indanone. indenylthioacetic acid. Cis-5 or 6-cyano-2-metl1yl-3-(4- (Dis-5 or fi-eyano-2-methyl-1-(4- methylthiobenzylidene)-1- methylsulfinylbenzylidene)-3- indauone.

indenylthioacetic acid. cis-5 or 6-a1lyloxy-2-mothyl3-(4- cis-5 or 6-a1ly1oxy-2methyl-1-(4- methylthiobenzylidene)-1- methylsulfinylbenzylideu'e) '3- indanone. indenylthioacetic acid.

cis-5 r fi-dimethylamino-Z-methyl- Cisor 6-dimethy1amino-2- 3-(4-methy1thiobenzylidene) -1- methyl-1-(4-methylsulfmyl indanone. be%ylidene)-3-indenylthi0acetic aci EXAMPLE 4 Cis-5,6-difiuoro-2-methyl-1-(4'-methylsulfinylbenzylidene)-3-indenyl-fi-thiopropionic acid EXAMPLE 5 N-[cis-5,G-difluoro-Z-methyl-1-(4'-methy1sulfinylbenzy1- idene) -3 -indenyl] -N-methyl glycine To methyl sarcosinate (0.206 g., 0.002 mole) in pyridine ml.) is added cis-3-chloro-5,6-difluorov2- methyl-1-(4'-methylsulfinylbenzylidene)-indene (0.701 g., 0.002 mole). The mixture is put under nitrogen and heated at reflux for 3 hours. The mixture is concentrated to dryness in vacuo, hydrochloric acid (6 N, 20 ml.) is added and the mixture refluxed for 4 hours. The mixture is again concentrated to dryness in vacuo, the residue is taken up in 2 N sodium hydroxide and extracted with benzene. The layers are separated, the aqueous phase extracted twice more with equal volumes of benzene. The aqueous phase is brought to pH 6 with hydrochloric acid and the mixture adsorbed onion exchange resin (1R 120011 the cycle). The product is eluted from the resin .with ammonium hydroxide (1 N), the eluate concentrated to dryness in vacuo and the residue crystallized from -iso propanol-Water to yield N-[cis-5,6-difluoro 2-methyl-1- (4' methylsulfinylbenzylidene) 3 indenyl]-N-methylglycine.

Using the reaction conditions and techniques of Example 5 the following compounds areobtained: 1

Starting material Product Cis-3-chloro-5 or 6-tluoro-2-methyl- N-[eis-5 or G-fluoro-Z-methyl-l-(y 1-(4-methy1su1finylbenzylidene)- methylsulfinylbenzylideue)-3- indene.

Cis-3-ehloro-5 or 6-cyano-2-methyl- 1-(4-methylsulfinylbenzylidene)- indene.

Cis-3-chloro-5 or G-aIlyIoxy-Z- methyl-1-(4-methylsu1finylbenzylidene)-indene.

Cis'3-ch1oro-5 or 6dimethy1amin0- 2-methyl-1-(4-methylsulfinylbenzylidene)-indene.

EXAMPLE 6 (A) N benbyl N [cis-5,6-difiuoro-2-methyl-1-(4- methylsulfinylbenzylidene)-3-indenyl]-glycine 3 Starting material A solution of N-benzyl-N- [cis-5,6-difluoro-2-methyl-1- (4' methylsulfinylbenzylidene-3-indenyl]-glycine (0.465 g., 0.001 mole) in acetic acid (20 ml.) is hydrogenated over 5% palladium on carbon (0.3 g.,) at room temperature (25) and 45 p.s.i. pressure. The hydrogenation is stopped when the uptake is 0.001 mole. The catatlyst is removed by filtration and the filtrate concentrated to yield N [cis 5,6 difiuoro Z-methyl-1-(4'-methylsu1finylbenzylidene -3 -indeny1] -glycine.

Using the reaction conditions and techniques of Examples 6-A and 6-M, the following compounds are ob-, tained.

Starting material Product 6-B methylsulfinyl- (4-methylsulfinylsulfinylbenzylidene) henzy11dene)-3- benzylidene)-3- 3-indenyl1-g1ycine. rndene. indenyl1-glycine.

Cis-3-ch1oro-5 or 6- N-benzyl-N-[cis-fior N-[cis-5 or fiallyloxya1lyloxy-2-methyl-1- fi-allyloxy-Z-methyl- 2-methyl-l-(4- (4methylsulfiny1- 1-(4-methylsulfinylmethylsulfinylbenzylidene)-3- benzylidene)-3- benzylidene)-3- indene. indeuyH-glycine. indenyll-glyeine.

Cis-3-chloro-5-or 6-di- N-benzyl-N-[cis-5 or N {cis-5 or G-dimethylmethylamino-2- fi-dimethylaminoamino-2-methyl-1- methyl-1-(4'-methyl- 2-methyl-1-(4- (4-methylsulfinylsu 1finylbenzy1idene)- methylsulfinylbenzylidene)-3- 3-1ndene. benzylidene)-3- indenyll-glycine.

indenyl1-glyclne.

EXAMPLE 7 Ethyl cis 5,6 difluoro 2 methyl 1 (4'-methylthiobenzylidene 3 indenyloxy) ,3 propionate (40.4

g., 0.1 mole) by the methods of Examples 6 and 7 is con- Verted to the subject compound.

EXAMPLE 8 N-[cis-5,6-difluoro-2-methyl-1-(4'-methylsulfinylbenzylidene)-3-indenyl]-N-methyl-p-alanine Ethyl N methyl p alanine (26.2 g., 0.002 mole) and cis 3 chloro 5,6 difiuoro 2 methyl 1 (4'- methylsulfinylbenzylidene)-indene (0.701 g., 0.002 mole) are condensed by the method of Example 5 to yield the subject material. i

Using the same reaction conditions and techniques, the following compounds are obtained:

Product EXAMPLE 9 (A) N-benzyl-N-[cis-5,6-difluoro-2-methyl-1-(4'-methylf sulfinylbenzylidene)-3-indenyl]-B-alanine By the method of Example 5, N-benzyl-fl-alanine, ethyl ester (0.414 g., 0.002 mole) is condensed with cis-3- Cis-3-ehloro-5 or Minerva-methyll-(4-methylsulfinylbenzylidene)- mdene.

Cis-3-chloro-5 or 6-allyloxy-2- methyl-1-(4'-methylsulfi.uylbenzylidene)-indene.

Cis-3-chloro-5 or 6-dimethy1amin0- 2-methyl-1-(4-methylsulfinylbenzylidene)-indene.

chloro-.5,6 difluoro 2 methyl 1 (4'-methylsulfinylbenzylidene)-indene to yield the subject compound.

' benzylidene)-3-indenyl]-fl-alanine N benzyl N [cis-5,6-difluoro 2-methyl-1-(4'-methylsulfinylbenzylidene) 3 indenyl] 13 alanine (0.001 mole) by the method of Example 6B is converted to the subject compound.

Starting material Product A Product B indenylI-B-alanine. alanine.

.benzylideneyindene. benzylidene)-3- 3-il1denyl1-B- indenyll-fl-alanine. alanine. alanine.

Cls-3-ehloro6 or 6- N-benzyl-[eis-5 or 6- N-[cis-5 or fi-allyloxyallylxy-2-methy1-1- allyloxy-2-methyl-1- 2-methyl-1-(4- (4-methylsu1finyl-' (4- methylsulfinylmethylsulfinylbenzylidene)-indene. benzylidene)-3- benzylidene)-3- indenyH-B-alanine. iudenylI-fi-alanine.

Cis-3-chl0ro-5 or 6- N-benzyl-[cis-5 or 6- N-lcis-5 or fi-dimethyldimethylamino-2 dimethylamino-2- amino-Z-methyl-lmethyl-1-(4-methylmethy1-1-(4- (y-methylsulfinylsulfinylbenzylidene)- methylsulfinylbenzyhdene)-3- indene. benzylideneH- indenyH-fi-alanine.

lndenylI-B-alamne.

EXAMPLE 10 (A) 3-hydroxy-4-methylthiobenzaldehyde o-Hydroxythioanisole (0.35 mole) in methylene chloride (200 ml.) is added to anhydrous aluminum chloride (66.67 g., 0.5 mole). The mixture is stirred and cooled while dichloromethyl methyl ether is added dropwise. After the solution is completed, the mixture is stirred for minutes at room temperature. The liquid phase is decanted into ice and water (300 g.) and the unreacted aluminum chloride is washed with methylene chloride until the washes are colorless. The washes and decanted material are combined. The layers are separated and the organic layer is washed with saturated potassium carbonate, dried (MgSO and distilled to yield 3-hydroxy-4- methylthiobenzaldehyde.

(B) Cisand trans-5,6-difluoro-3,3-ethylenedioxy-2-methyl-1 (3-hydroxy-4methylthiobenzylidene)-indane A solution of 3-hydroxy-4-methylthiobenzylmagnesium bromide is prepared from 3-hydroxy-4methylthiobenzylbromide (0.5 mole) in ether (1 liter) by the recycling procedure of Rowlands et al. [Grignard Reactions of Nonmetallic Substances, M. Kharasch and O. Reinmuth, Prentice Hall, 1954, pp. 23-24]. This is added dropwise to a rapidly stirred solution of 5,6-difluoro-3,3-ethylenedioxy-Z-methyl-l-indanone (120.1 g., 0.5 mole) from Example 1-B in ether (2 liters) at 0 at such a rate that the Gilman test for free Grignard Reagent is never positive. At the end of the addition period the mixture is warmed to -2S and maintained for 2 hours. The mix ture is cooled to 510, quenched with 700 ml. of saturated ammonium chloride, filtered, the ethereal solution washed with water, saturated sodium chloride solution and dried (MgSO The ethereal mixture is concentrated to 1500 ml., pyridine (150 ml.) is added," the mixture cooled to 10, and thionyl chloride (71.4 g., 0.6 mole) is added dropwise with stirring. After'the addition is completed the mixture is allowed to warm spontaneouslyto room temperature and poured intowater and ice (2 kg). After thorough mixing the layers are separated, the ether layer is washed with water, dried (MgSO and concentrated in atmospheric pressure, then in vacuo. The residue is chromatographed on silica gel-and elutedwith methanolic chloroform toobtain cisand trans-5,6-difluoro-3,3-ethylene;- 2 methyl-1-(3'-hy.- droxy 4' methylthiobenzylidene) indane and -.these individually'recrystallized from ethyl acetateen-hexane.

10 (C) Cis-5,6-difiuoro-2-methyl-3-(3'-hydroxy-4'- methylthiobenzylidene)-1-indanone The cis ketal (0.3 mole) of Example 10-B in acetic acid (2 liters) is heated for 20 minutes on the steam bath. The mixture is concentrated in vacuo to ca. one-fourth of the original volume and the concentrate diluted with an equal volume of water and extracted with ethyl acetate (3X 750 ml.). The ethyl acetate extract is extracted with water, 5% sodium carbonate solution, water and saturated salt solution. The ethyl acetate extract is dried (MgSO and concentrated to dryness in vacuo. The residue is crystallized from acetone-n-hexane to yield cis-5,6-difiuoro 2 methyl-3-(3'-hydroxy-4-methylthiobenzylidene)-1-indanone.

. (D) Ethyl cis-5,6-difiuoro-2-methyl-1-(3-hydroxy-4'- methylthiobenzylidene)-3-indenyloxyacetate To a mixture of indanone (0.2 mole) from Example 10-D in dimethoxyethane (733 ml.) is added gradually with stirring at 10-15 an oil-free suspension of sodium hydride (4.8 g., 0.2 mole). When hydrogen evolution is complete, ethyl bromoacetate (33.4 g., 0.2 mole) is added dropwise with stirring at l520. The mixture is slowly warmed to 60 with stirring and maintained thus for 2 hours. The mixture is cooled to 20, cautiously diluted with water (750 ml.) and extracted with benzene (3X 1 liter). The benzene extract is washed with water, saturated salt solution, dried (MgSO and concentrated to dryness in vacuo. The residue is crystallized and recrystallized from ethyl acetate-n-hexane to yield ethyl cis- 5,6-difluoro 2 methyl-1(3' hydroxy-4'-methylthiobenzylidene)-3-indenyloxyacetate.

(E) Cis- 5,6-difluo ro-2-methyl- 1- 3 -hydroxy-4'-methylthiobenzylidene -3-indenyloxyacetic acid A mixture of ethyl cis-5,6-difluoro-2-methyl-1-(3-hydroxy-4'-methylthiobenzylidene) 3 indenyloxyacetate (0.1 mole) and sodium hydroxide (1 N, 300 ml.) is heated at reflux under nitrogen with stirring for 2 hours. The mixture is cooled, diluted with water and acidified With 50% acetic acid. The mixture is filtered, the precipitate Washed with water and dried in air at 25. The residue is recrystallized from acetone-n-hcxane to yield cis-5,6-difluoro 2 methyl-1-(3-hydroxy-4'-methylthiobenzylidene)-3-indenyloxyacetic acid.

(F) Cis-S,6-difluoro-2-methyl-1-(3'-hydroxy-4'-methylsulfinylbenzylidene)-3-indenyloxyacetic acid Sodium metaperiodate trihydrate (11.3 g., 0.0422 mole) in water m1.) is added to cis-5,6-difiuoro-2- methyl-l-(3-hydroxy 4' methylthi0benzylidene)-3- indenyloxyacetic acid (0.01 mole) in methanol '(240 ml.) and acetone (10 ml.) at room temperature. The mixture is, stirred overnight after which only a trace of starting material remains and only a trace of sulfone has formed. The mixture is concentrated to small volume, diluted with water and filtered. The precipitate is washed well with water, dried in air, then in vacuo at 50 and recrystallized from ethyl acetate-n-hexane to yield cis-5,6-difluoro- 2-methyl-l(3'-hydroxy 4' methylsulfinylbenzylidene)- 3-indenyloxyacetic acid.

Using the reaction conditions and techniques of Example 10, Steps A through F, when o-chlorothianisole, obromothioanisole and o cyanothioanisole are used, there is obtained cis 5,6 difluoro 2 methyl 1 (3 chloro'} 4' methylsulfinylbenzylidene) 3 indenyloxyacetic acid, cis 5,6 difluoro 2 methyl- 1-(3-bromo-4-methylsulfinylbenzylidene) 3 indenyloxyacetic acid, and cis-5,6-difluoro-2-methy1-1-(3'-cyano- 4-methylsulfinylbenzylidene)-3-indenyloxyacetic acid, respectively.

. EXAMPLE 11 '(A) o-(fi-hydroxyethoxy)-thioanisole o Hydroxythioanisole (14.1 g., 0.1 mole) is dissolved insodium ethoxide (6.8 g., 0.1 mole) in absolute ethanol (100 ml.) .and. stirred as ,G-hydroxyethylchlor'ide(8.1 g., 0.1 mole) is added. The reaction mixture'is refluxed for 2 hours and cooled. The o-(B-hydroxyethoxy)-thioanisole is extracted. Using the same reaction conditions: and techniques, 'when o-hydroxythioanisole is reacted with fl-hydroxy} rnethyl chloride, 'fl-hydroxypropylchloride or -;S-hydroxy,- butyl chloride, there islobtained o-(fl-hydroxymethoxyy thioanisole, 'o-(fi-hydroxypropoxy)-thio'anisole and 9(8- hydroxybutoxy) thioanisole, respectively. v v I (B=) :sCis '51- fluoro 2 -'methyl'.-.1'-".(3' p hydroxyethoxy 4. methylsulfinylbenzylidene) V3 indenyloxy- .acetic acid i I i i The product of Example l1-A is reacted by the methods of Examples 10A,-10-B and 10-Cto obtain cis- 5-fitioro- 2 methyl- 1 (3 [3 'hydroxyethoxy 4' methylsulfinylbenzylidene)-3-indenyloxyacetic acid.

In this manner the other thioanisoles-of Examples 11--A may be reactedto form the corresponding indenyloxy acetic acid. V I I EXAMPLE 12 U i (A) o-(B-chloroethoxy)-thioanisole o-(fl Hydroxyethoxy)-thioanisole (0.1 mole) is refluxed in excess thionyl chloride andevaporated to drynessto yield o-(fl-chloroethoxy)-thioanisole. ,1 'In alike manner, other o-(phydroxyalkoxy),-thioanisoles may be refluxed with other thionyl halides to yield the appropriate o-(B-haloalkoxy)-thioanisole as, for example, o-(p-bromomethoxy)-thioanisole, o-(fl-chloropropoxy)-thioanisole, or o-(,B-bromobutoxy)-thioanisole.

(B) Cis ,5 fiuoro 2 methyl 1 (35 6.: chloroethoxy 4 methylsulfinylbenzylidene)1-3 indenyloxyacetic acid The product of Example 12-A is reacted byrqthe methods of Examples 10-A, 10-B and 10-C to obtain cis-"5- fiuoro-Z -methyl 1 (3' B chloroehtoxy 4"- methI- ylsulfinylbenzylidene)-3-indenyloxyacetic acid.; s In this manner the other thionanisoles of Exam 'le".12- A maybe reacted to form the corresponding indenyloxyacetic acid. y

EXAMPLE 13 (A) o-Eth'oxythioanisole o-Chlorothioanisole (15.85 g., 0.1 molejis. stirred at reflux in 'nitrobeniene containin g'copper powder (100 mg.) and sodium ethoxide (6.8 g., 0.1 mole) tfor 2' hours. The product is steam distilled and the distillate dried and fractionally distilled under reduced. pressure to'y'ield oethoxothioanisole. Y I 9 1 Using the same reaction conditions'an'd techniques, when o-chlorothioanisole is reacted with sodiummethoxide, sodium propoxide and sodium t-butoxid'egtlier "s obtained o-methoxythioanisole, o-propoxythioariisolend' t-butoxythioanisole, respectively.

sulfinylbenzyliden'e)-3-indenylacetic acid-1 i The product of Example 13-A is reactedby 'the methods of Examples 10 A,"10B,'ai1d 10-0125 obtain fluoro 2 methyl 1 (3'-ethoxy-4'-meth "tl'lfi z'ylidene)a3-indenyloxyacetic acid.

In this manner the other thioanisoles of-Example 139A may be reacted to form the corresponding denyloxyacetic'acid.

benzylidene)-3-indenyloxyacetate Cis 5 fluoro 2-m'ethy1 1-(4'-methylsulfinylbenzylidene)-3-indenyloxyacetic acid (0.03 mole) 'isrdissolved in methanol 50 ml.), concentrated sulfuric -ac id. (ll.0a ml.) isadded and the mixture heated at, refiux-rforilhours.

The'mixture is cooled, poured into ethyl 'acetate andextracted successively; .with saturated sodiumfibi'carbonate, water and saturated-salt: solution. The ethyl acetate extract is dried (MgSO ),'fcoricentrated to, dryness "and the residue crystallized from ethyl "acetate-n-hexane.

. E P E A Cis-5-fluoro=2-methyl 1'-(3';fluoro14 methylsulfinyl 1 benzylidene)-3-indenylthioacetamide-; 6'18"5TT fluoro 2 methyk 1'-"(3 ,'fluoro-4 rnethylsgl finylb enzylidene )s 3:i.ndenylthioacetic acid. (0.0.1. .inol'e)"v is warmed with thionyl chloride" (5 ml.) for- 25 rnil'lutes; The mixture iscooledtoQZS'Kand poured with stirring into ice-cold concentrated ammonia solution. The precipitated amide is,washed, with wat er,.dried and recrystallized from methanol water to yield cis-S-fiuOr -B-methyl-I liuoro 4 methylsulfinylbenzylidene) 3 inderiylth'ioacetamide.*-"- Y Similarly, when ammonia 'is replaced by an equivalent amount of 'th'efollowing amines, the corresponding amides are obtained. 1 1 i.

Morpholine v Dimethyl'amine." Ethanolamine Be'nzylamine'- N,N-diethylethylenediamine Benzylglycinate Piperidine Pyrrolidine N-methylpiperazine N-phenylpiperazine N-hydroxyethylpiperazine Piperazine f Diethyla'mine I p Diethanolamine n. i.n .@:m p Ethoxyaniline p-Chloroaniline p-Fluoroaniline w p-Trifluoromethylaniline Butylamine I, H Cy'elohe'xylamine' rMethylamine D-glucosaminex- I 1 Tetra-o-acetyl-d glucosamine r D-galactosylaminev t D maniio'sylamine N,N- dimeth-ylglycine amide. N,N;dibutylglycine amide 1 'mQ Y T Tam nomethylpiperidine, v ,N fihY -Z:aminomethylpyrrolidine I r-Et x e yl mine DiIQ-ethOxyethylJamine fi-Phfit y am f I il heiljethylamine i Diben l D-iiiinnos'amine If ben'zylidene 3 indeny1oxyacetate .7 Cis- 55 fluoro;:'-2 methyl-1=(4-methylsulfiny1ben2ylidene)-3-1ndeny1oxyaceticacid (0301 niole')" is'added'to 1sobutylener1"(5'0-51m1; and concentrated acid (01 1 ml.-). fiEhewmixture is 'stoppered ecurely and shaken "at 2 5? 01118 hoursrichilled'to'w and the'whole 'poured into a-separatory. funnel contain'ihg =ethei"-(-50 ml); ater 25 mi, rce,( 25"1'nl.') iandasiod ium hydfoxide (101 layers; are separated; the water layr extracted wit r (2X- 40 inlf),, the: ethereal extracts washed with wa r and v :saturated salt soluti'or'rf and dried ('Mg'sor) Z The ethereal-t extract is concentratedto'dryriess andthe residife crystallized-from ethylacetate-fi exaiie'toyieldithe Ject comp undw 13 EXAMPLE 17 Ammonium cis--allyloxy-2-methyl-1-(4'-methylsulfinylbenzylidene)-3-indenylthioacetate To cis-5-allyloxy-2-methyl-1-(4'-methylsulfinylbenzylidene)-3-indenylthioaeetic acid (0.001 mole) in methanol ('10 ml.) is added methanolic ammonia (l N, 1 ml.). The mixture is evaporated to dryness to yield the subject EXAMPLE 18 Calcium cis-5-fluoro-2-methyl-l-(4 -methylsulfinyl- ""b'enzylidene) -3-indenyloxyacetate EXAMPLE 19 Aluminum cis-S-chloro-Z-methyl-1-(4'-methylsulfinylbenzylidene) -3-indeny1oxyacetate To a solution of aluminum tert-butoxide (0.246 g., 0.001 mole) in ether (50 ml.) is added cis-5-chloro-2- methyl 1 (4'-methylsulfinylbenzylidene)-3-indenyloxyacetic acid (0.003 mole) in pyridine (50 ml.) with stirring at The mixture is concentrated to dryness in vacuo to yield the subject compound.

EXAMPLE 20 Sodium cis-5-fluoro-2-methy1-l-(4'-methylsulfinylbenzylidene)-3-indenyloxyacetate To cis-5-fluoro-2-methyl-1-(4' methylsulfinylbenzylidene)-3-indenylthioacetic acid (0.001 mole) in methanol is added methanolic sodium methoxide (0.1 N, 10 ml.). The mixture is concentrated to dryness in vacuo to yield the subject compound.

EXAMPLE 21 Methoxymethyl cis-S-allyloxy-Z-methyl-l-(p methylsul-finylbenzylidene)-3-indenyloxyacetate Chloromethyl methyl ether (0.055 mole) is added to a suspension of cis-S-allyloxy-Z-methyl-l-(p-methylsulfinlybenzylidene)-3-indenyloxyacetic acid (0.05 mole) and anhydrous potassium carbonate (0.15 mole) in 250 m1. of anhydrous acetone. The mixture is allowed to stir overnight at room temperature. Diethyl ether is added (about 200 ml.) and the mixture is filtered. The filtrate is washed once with 100 ml. of water and dried over anhydrous sodium sulfate. It is then filtered and the solvent is removed in vacuo. The residue is chromatographed on 200 g. of acid-washed alumina, using ether-petroleum ether (varying from 10 to 60% ether by volume) as the eluent, to give methoxymethyl cis-5-allyloxy-2-methyl-1- (p-methylsulfinylbenzylidene)-3-indenyloxyacetate.

EXAMPLE 22 fi-Diethylaminoethyl cis-5-allyloxy-2-methyl-1-(pmethylsulfinylbenzylidene)-3-indenyloxyacetate A solution of 0.0054 mole of N,N'-dicyclohexylcarbodiimide in 6 ml. of anhydrous tetrahydrofuran is added to a solution of cis-S-allyloxy-Z-methyl-l-(p-methylsulfinylbenzylidene)-3-indenyloxyacetic acid (0.005 mole) and Z-diethylaminoethanol (0.0054 mole) in 17 ml. of anhydrous tetrahydrofuran. The mixture is stirred at ambient temperature overnight. The dicyclohexylurea is removed by filtration and 2 ml. of glacial acetic acid is added to the filtrate. After the mixture has stood for one hour, it is filtered and 200 ml. of ether is added to the filtrate. The solution is then extracted three times with 100 ml. of 2.5 N HCl and the extracts are combined, washed twice with 100 ml. of water to remove traces of starting amine, dried over anhydrous potassium carbonate, filtered, and evaporated in vacuo. The oily residue is fi-diethylaminoethyl cis-S-allyloxy-Z-methyl l (p-methylsulfinylbenzylidene)-3-indenyloxyacetate.

When 2-dimethylaminoethanol, 3-dimethylamino-l-propanol, B-diethylamino-l-propanol, N-B-hydroxyethylpiperidine, N-B-hydroxyethylpyrrolidine, N-hydroxymethylpyrrolidine, N-methyl 2 hydroxymethylpyrrolidine, "N- ethyl 2 hydroxymethyl-piperidine, 1-fl-hydroxyethyl-4'- methylpiperazine, or N-fl-hydroxyethyl morpholine is used in the above procedure in place of Z-diethylaminoethanol, the corresponding p-dimethylaminoethyl, 'ydimethylaminopropyl, 'y-diethylaminopropyl, fl-N-piperidinylethyl, B-N-pyrrolidinylethyl, N-pyrrolidinylmethyl, a'-(l'-methylpyrrolidinylmethyl), 4-methyl-l-piperazinylethyl, N- ethyl-Z-piperidinylethyl and N-morpholinylethyl esters are obtained.

What is claimed is:

1. A compound of the formula R: X (CH2) n C 0M R: l H

Ru R wherein R is hydrogen or loweralkyl;

R and R are hydrogen;

R and R are each hydrogen, halogen, loweralkoxy,

or loweralkenyloxy;

R is hydrogen, halogen, hydroxy, loweralkoxy;

R is loweralkylsulfinyl;

Ar is phenyl;

n is 1 or 2; and

M is hydroxy, lowerallcoxy, loweralkoxy-loweralkoxy, diloweralkylamino-loweralkoxy or OMe wherein Me is the cation of a pharmaceutically acceptable salt.

2. The cis and trans isomers of a compound of claim 1.

3. A compound of claim 1 wherein X is O;

n is 1;

R is methyl;

R R R and R are each hydrogen;

R is methylsulfinyl; and

M is hydroxy.

4. The compound of claim 1 wherein X is O;

n is 1;

R is methyl;

R R and R are each hydrogen;

R and R are each fluoro;

R is methylsulfinyl; and

M is hydroxy.

5. A compound as in claim 1 wherein X is O;

n is 1;

R is hydrogen;

R is methyl;

R is hydrogen;

R and R are hydrogen;

R is methylsulfinyl; and

M is hydroxy.

6. A compound as in claim 1 wherein X is O;

n is 1;

15 R is hydrogen; R is methyl; R is hydrogen; R is chloro; R and R are hydrogen; R is methylsulfinyl; and M is hydroxy. 7. A compound as in claim 1 wherein X is O; n is 2; R is hydrogen; R is methyl; R is hydrogen; R is fluoro; R and R are hydrogen; R7 is methylsulfinyl; and M is hydroxy.

References Cited UNITED STATES PATENTS 3,312,730 4/1967 Winters et a1. 260-470 X 5 FOREIGN PATENTS 1,178,658 1/1970 England 260520 OTHER REFERENCES Roberts et 111., Basic Principles of Organic Chemisgry, 10 W. A. Benjamin Inc., New York, NY. (1965), p. 758.

LORRAINE A. WEINBERGER, Primary Examiner J. F. TERAPANE, Assistant Examiner 15 us. 01. X.R.

260-2421, 268 0, 293.62, 326.3, 326.5 s, 340.9, 448, 465 R, 465 s, 470, 516, 51s A, 519, 558 s, 559 T, 590, 600, 609 E 

